1281281 has 2 divisors, whose sum is σ = 1281282. Its totient is φ = 1281280.

The previous prime is 1281263. The next prime is 1281283. The reversal of 1281281 is 1821821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 839056 + 442225 = 916^2 + 665^2 .

It is an emirp because it is prime and its reverse (1821821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1281281 - 2¹⁴ = 1264897 is a prime.

It is a super-2 number, since 2×1281281² = 3283362001922, which contains 22 as substring.

Together with 1281283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1281283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640640 + 640641.

It is an arithmetic number, because the mean of its divisors is an integer number (640641).

2^1281281 is an apocalyptic number.

It is an amenable number.

1281281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281281 is an equidigital number, since it uses as much as digits as its factorization.

1281281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 23.

The square root of 1281281 is about 1131.9368356936. The cubic root of 1281281 is about 108.6129130976.

The spelling of 1281281 in words is "one million, two hundred eighty-one thousand, two hundred eighty-one".